Compacted clay layer below 18024. Patches of red/orange interpreted as either terracotta dust or run off from levigation process. Tentatively interpreted as floor layer prior to cobblestone (18030) being placed above, and 18024 deposited over both 18033 and 10830
SU18033: view toward north SU18037: concentration of white mortar in NW corner
SU18033: detail view toward north